Heat pump defrosting control method, device and equipment and storage medium

Abstract

The invention belongs to the technical field of electric appliances, and particularly relates to a heat pump defrosting control method and device, equipment and a storage medium. The method comprises the steps that the surface temperature of a heat pump evaporator is detected, and the environment temperature and relative humidity of the environment where the heat pump evaporator is located are detected; the defrosting duration is determined according to the environment temperature and the relative humidity; and when the accumulated operation duration of the compressor reaches the defrosting duration and the surface temperature of the evaporator meets a preset temperature condition, the heat pump is controlled to execute a defrosting program on the evaporator. The defrosting duration is determined according to the environment temperature and the relative humidity, when the accumulated operation time of the compressor reaches the defrosting duration and the surface temperature of the evaporator meets the preset temperature condition, the heat pump is controlled to execute the defrosting program on the evaporator, and the influence of the environment temperature and the relative humidity on the frosting state of the evaporator is considered; the defrosting state of the evaporator during defrosting is unified, the conditions of defrosting without frost and defrosting with shallow frost are avoided, and the energy efficiency of the heat pump is improved.

Description

Technical Field

[0001] The present application belongs to the field of electrical appliance technology, and specifically relates to a heat pump defrosting control method, device, equipment, and storage medium. Background Art

[0002] When the surface temperature of the heat pump evaporator coil is lower than the air dew point and freezing point at the same time, frost will form. In actual operation, the heat pump will inevitably undergo frost and defrost, which will inevitably cause heat loss, thereby reducing the energy efficiency of the heat pump.

[0003] Most existing heat pump defrosting methods use temperature-time control, that is, when the surface temperature of the evaporator coil is lower than a certain set value, the heat pump unit controller starts recording the running time, and when the running time reaches a certain set value, the unit is defrosted.

[0004] The disadvantage of the above method is that it only considers the influence of the surface temperature of the evaporator and the operation time of the heat pump unit on the frosting of the evaporator, resulting in non-uniform frosting state of the evaporator when the defrosting conditions of the above method are met, and frost-free defrosting and shallow frosting defrosting may occur, reducing the energy efficiency of the heat pump. Summary of the invention

[0005] The present application provides a heat pump defrost control method, device, equipment, and storage medium to solve the problem in the prior art that only the influence of the surface temperature of the evaporator and the operating time of the heat pump unit on the frosting of the evaporator is considered, resulting in an inconsistent frosting state of the evaporator when the defrosting conditions are met, and frost-free defrosting and shallow frosting defrosting may occur, thereby reducing the energy efficiency of the heat pump.

[0006] In a first aspect, the present application provides a heat pump defrost control method, the method comprising:

[0007] Detecting the surface temperature of the heat pump evaporator, and detecting the ambient temperature and relative humidity of the environment in which the heat pump evaporator is located;

[0008] Determining the defrosting time according to the ambient temperature and the relative humidity;

[0009] When the accumulated operation time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, the heat pump is controlled to perform a defrosting procedure on the evaporator.

[0010] In the above preferred technical solution of the heat pump defrosting control method, the step of determining the defrosting time according to the ambient temperature and the relative humidity includes:

[0011] Determine the ambient temperature interval in which the ambient temperature is located according to the ambient temperature;

[0012] The defrost duration is determined according to the ambient temperature range and the relative humidity.

[0013] In the above preferred technical solution of the heat pump defrosting control method, determining the defrosting time according to the ambient temperature range and the relative humidity includes:

[0014] If the ambient temperature is in the defrosting ambient temperature range, the greater the relative humidity, the shorter the defrosting time.

[0015] In the above preferred technical solution of the heat pump defrosting control method, the detecting the surface temperature of the heat pump evaporator includes:

[0016] If the surface temperature of the heat pump evaporator is less than or equal to the first preset temperature threshold, the low temperature duration of the heat pump evaporator is recorded, and the low temperature duration is the duration that the surface temperature of the heat pump evaporator is less than or equal to the preset temperature threshold.

[0017] In the above preferred technical solution of the heat pump defrosting control method, the evaporator surface temperature meets the preset temperature condition, including:

[0018] The low temperature duration reaches a first low temperature duration threshold.

[0019] In the above preferred technical solution of the heat pump defrost control method, before detecting the surface temperature of the heat pump evaporator, and detecting the accumulated running time of the heat pump compressor, the ambient temperature and relative humidity of the environment in which the heat pump outdoor unit is located, the method further includes:

[0020] After the heat pump is powered on for the first time, the accumulated running time of the heat pump compressor is recorded, and the surface temperature of the heat pump evaporator is detected;

[0021] When the accumulated operation time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, the heat pump is controlled to perform a defrosting procedure on the evaporator, and the accumulated operation time of the heat pump compressor is cleared.

[0022] In the above preferred technical solution of the heat pump defrosting control method, the accumulated running time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, including:

[0023] The accumulated operation time of the heat pump compressor reaches a fifth preset time, and the duration of the surface temperature of the heat pump evaporator being lower than the second preset temperature threshold reaches a second low temperature duration threshold.

[0024] In a second aspect, the present application provides a heat pump defrost control device, the device comprising:

[0025] An evaporator temperature detection module, used to detect the surface temperature of the heat pump evaporator;

[0026] An environmental temperature and humidity detection module, used to detect the environmental temperature and relative humidity of the environment in which the heat pump outdoor unit is located;

[0027] A cumulative operation time recording module, used to record the cumulative operation time of the heat pump compressor;

[0028] Control module for:

[0029] Determining the defrosting time according to the ambient temperature and the relative humidity;

[0030] When the accumulated operation time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, the heat pump is controlled to perform a defrosting procedure on the evaporator.

[0031] In a third aspect, the present application provides a heat pump defrost control device, the device comprising:

[0032] Processor, memory, and interactive interface;

[0033] The memory is used to store programs and data, and the processor calls the program stored in the memory to execute the heat pump defrost control method as described above.

[0034] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the heat pump defrost control method as described above is implemented.

[0035] The present application provides a heat pump defrost control method, device, equipment, and storage medium, which determine the defrost duration according to the ambient temperature and relative humidity. When the cumulative running time of the compressor reaches the defrost duration and the surface temperature of the evaporator meets the preset temperature conditions, the heat pump is controlled to execute the defrost procedure on the evaporator. The influence of the ambient temperature and relative humidity on the frosting state of the evaporator is taken into consideration, so that the frosting state of the evaporator during defrosting is more uniform, avoiding frost-free defrosting and shallow frosting defrosting, and improving the energy efficiency of the heat pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0037] Figure 1 It is a flow chart of a heat pump defrosting control method provided by an embodiment of the present application;

[0038] Figure 2 This is a flow chart of a method for determining the defrosting time according to the ambient temperature and relative humidity provided in an embodiment of the present application;

[0039] Figure 3 is another heat pump defrosting control method flow chart provided by the present application;

[0040] Figure 4 is a schematic diagram of a heat pump defrost control device provided in an embodiment of the present application;

[0041] Figure 5 It is a schematic diagram of a heat pump defrost control device provided in an embodiment of the present application.

[0042] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein, for example.

[0045] In the embodiments of the present application, the words "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0046] When the heat pump compressor is running, the surface temperature of the evaporator is low. When the surface temperature of the heat pump evaporator coil is lower than the air dew point and freezing point at the same time, frost will form. Frosting of the evaporator will reduce the air flow and heat exchange efficiency, thereby reducing the operating efficiency of the heat pump. Therefore, the heat pump needs to be defrosted.

[0047] As described in the background technology, in the defrosting control method of existing heat pumps, such as air source heat pumps, only the influence of the surface temperature of the evaporator and the operation time of the heat pump unit on the frosting of the evaporator is considered, that is, when the surface temperature of the evaporator coil is lower than a certain set value, the heat pump unit controller starts to record the operation time, and when the operation time reaches a certain set value, the unit is defrosted. In fact, the surface frosting speed of the heat pump evaporator is not only related to the surface temperature of the evaporator, which leads to the non-uniform frosting state of the evaporator when the defrosting conditions are met, and there will be frost-free defrosting and shallow frosting defrosting, which reduces the energy efficiency of the heat pump.

[0048] In order to solve the above technical problems, the technical concept of the present application is: determine the defrost time according to the ambient temperature and relative humidity of the environment where the evaporator is located, and when the cumulative running time of the compressor reaches the defrost time and the evaporator temperature meets the preset temperature conditions, control the heat pump to perform the defrost program on the evaporator.

[0049] The technical concept of the present application and how the technical concept of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0050] In a possible embodiment of the present application, a heat pump defrost control method is provided, which can be applied to a control unit of a heat pump, in particular a control unit of a split air source heat pump. Figure 1 is a flow chart of a heat pump defrosting control method provided by an embodiment of the present application, such as Figure 1 As shown, the method includes:

[0051] S101, detecting the surface temperature of the heat pump evaporator, and detecting the ambient temperature and relative humidity of the environment in which the heat pump evaporator is located;

[0052] The surface temperature of the evaporator can be detected by a temperature sensor, and the ambient temperature and relative humidity can be detected by a temperature and humidity sensor installed on one side of the evaporator. If the evaporator is placed outdoors, the weather forecast of the outdoor environment can also be obtained through the Internet, thereby obtaining the ambient temperature and relative humidity of the environment where the heat pump evaporator is located.

[0053] Optionally, detect the heat pump evaporator surface temperature, including:

[0054] If the surface temperature of the heat pump evaporator is less than or equal to the first preset temperature threshold, the duration of the low temperature of the heat pump evaporator is recorded. The duration of the low temperature is the duration of the surface temperature of the heat pump evaporator being less than or equal to the preset temperature threshold. The first preset temperature threshold is lower than the air dew point temperature and the freezing point temperature. When the surface temperature of the heat pump evaporator is less than or equal to the first preset temperature threshold, the surface of the evaporator may be frosted. In this embodiment, the first preset temperature threshold may be -2°C.

[0055] S102, determining the defrosting time according to the ambient temperature and relative humidity;

[0056] According to the inventor's experiments, the ambient temperature and relative humidity affect the frost formation speed on the surface of the heat pump evaporator, not just the evaporator surface temperature:

[0057] ①According to the actual test data, when the ambient temperature is greater than 5℃, frosting can be ignored;

[0058] ② When the relative humidity is greater than 75% and the ambient temperature is less than or equal to 5°C, the time required for defrosting to reach the necessary level (the unit performance shows obvious attenuation) is linearly related to the ambient temperature. The lower the ambient temperature, the less time is required.

[0059] ③ When the relative humidity is 50%≤≤75% and the ambient temperature is ≤5℃, the time required for the frost level to reach the necessary defrosting (the unit performance shows obvious attenuation) is less than the time required when the relative humidity is greater than 75%, and the unit's operating energy efficiency is improved at a defrosting interval of 1h50min;

[0060] ④ When the relative humidity is less than 50%, the unit will not frost or will always have shallow frost at all ambient temperatures, and there is no need for defrosting.

[0061] For heat pumps of different models, the thickness of frost on the evaporator surface may be different when defrosting is necessary, so the thickness of defrost in their defrost programs may also be different. For a heat pump of a certain model, after determining the defrost thickness of its defrost program, the corresponding relationship between different ambient temperatures, relative humidity and defrost duration can be calculated or determined through experiments to ensure that when the cumulative running time of the compressor reaches the defrost duration, the thickness of frost on the evaporator surface just reaches the defrost thickness of the defrost program, and the corresponding relationship between different ambient temperatures, relative humidity and defrost duration is stored in the storage unit in advance. When the heat pump detects the ambient temperature and relative humidity of the environment where the evaporator is located, the corresponding defrost time can be obtained.

[0062] S103: When the accumulated running time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, control the heat pump to perform a defrosting procedure on the evaporator.

[0063] Optionally, the evaporator surface temperature meets a preset temperature condition, including:

[0064] The low temperature duration reaches the first low temperature duration threshold. When the duration of the evaporator surface temperature below the first preset temperature threshold reaches the first low temperature duration threshold, and the cumulative running time of the compressor reaches the defrosting time of the current ambient temperature and relative humidity, the frost thickness on the evaporator surface reaches the defrosting thickness of the heat pump defrosting program, then the heat pump is controlled to perform the defrosting program on the evaporator. The first low temperature duration threshold can be 1 minute.

[0065] The technical effect of this embodiment is: the defrost time is determined according to the ambient temperature and relative humidity. When the cumulative running time of the compressor reaches the defrost time and the surface temperature of the evaporator meets the preset temperature conditions, the frost thickness on the evaporator surface reaches the defrost thickness of the heat pump defrost program. At this time, executing the defrost program can avoid frost-free defrosting and shallow frost defrosting, thereby improving the energy efficiency of the heat pump.

[0066] In a possible embodiment of the present application, a method for determining the defrost duration according to the ambient temperature and relative humidity is provided. Figure 2 : is a flow chart of a method for determining the defrosting time according to the ambient temperature and relative humidity provided in an embodiment of the present application, such as Figure 2 As shown, the method includes:

[0067] S201, determining the ambient temperature range of the ambient temperature according to the ambient temperature;

[0068] S202: Determine the defrost duration according to the ambient temperature range and relative humidity.

[0069] Optionally, if the ambient temperature is in the defrost ambient temperature range, the greater the relative humidity, the shorter the defrost time.

[0070] In this embodiment, the defrosting environment temperature range may be:

[0071] First defrosting ambient temperature range: first ambient temperature threshold ≤ T ≤ second ambient temperature threshold;

[0072] Second defrosting ambient temperature range: T<first ambient temperature threshold or T>second ambient temperature threshold;

[0073] In this embodiment, T is the ambient temperature. When the relative humidity is the same, the defrost time corresponding to the first defrost ambient temperature interval is less than the defrost time corresponding to the second defrost ambient temperature interval. The first ambient temperature threshold may be -4°C, and the second ambient temperature threshold may be 3°C. The corresponding relationship among the defrost ambient temperature interval, relative humidity, and defrost time may be, for example:

[0074] If the ambient temperature is -4℃≤T≤3℃, and the relative humidity is ≥70%, the defrosting time is 40 minutes;

[0075] If the ambient temperature is -4℃≤T≤3℃, and the relative humidity is less than 70%, the defrosting time is 90 minutes;

[0076] If the ambient temperature T<-4℃ or T>3℃, relative humidity ≥70%, the defrosting time is 90 minutes;

[0077] If the ambient temperature T<-4℃ or T>3℃, relative humidity<70%, the defrosting time is 120min;

[0078] In actual operation, the correspondence between the above-mentioned defrost ambient temperature range, relative humidity and defrost time can be pre-stored in a storage unit. After detecting the ambient temperature and relative humidity of the evaporator environment, the defrost time can be determined according to the defrost ambient temperature range and relative humidity range of the ambient temperature.

[0079] In a possible embodiment of the present application, another heat pump defrost control method is provided. Figure 3 is another heat pump defrosting control method flow chart provided by the present application, such as Figure 3 As shown, the method includes:

[0080] S301, after the heat pump is powered on for the first time, record the cumulative running time of the heat pump compressor and detect the surface temperature of the heat pump evaporator;

[0081] S302, when the accumulated operation time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, control the heat pump to perform a defrosting procedure on the evaporator, and clear the accumulated operation time of the heat pump compressor to zero;

[0082] Optionally, the accumulated operating time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrost conditions, including:

[0083] The cumulative operation time of the heat pump compressor reaches the fifth preset time, and the duration of the heat pump evaporator surface temperature being lower than the second preset temperature threshold reaches the second low temperature duration threshold. In this embodiment, the fifth preset time can be 30 minutes, the second preset temperature threshold can be -2°C, and the second low temperature duration threshold can be 1 minute.

[0084] S303, detecting the surface temperature of the heat pump evaporator, and detecting the ambient temperature and relative humidity of the environment in which the heat pump evaporator is located;

[0085] S304, determining the defrosting time according to the ambient temperature and relative humidity;

[0086] S305: When the accumulated running time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, the heat pump is controlled to perform a defrosting procedure on the evaporator.

[0087] It should be noted that the accumulated operation time of the compressor in S305 is the accumulated operation time of the compressor after the accumulated operation time of the heat pump compressor is cleared to zero in step S302.

[0088] In a possible embodiment of the present application, a heat pump defrost control device is provided. Figure 4 Schematic diagram of a heat pump defrosting control device provided in an embodiment of the present application. Figure 4 As shown, the device 40 includes: an evaporator temperature detection module 401, an ambient temperature and humidity detection module 402, a cumulative operation time recording module 403, and a control module 404;

[0089] The evaporator temperature detection module 401 is used to detect the surface temperature of the heat pump evaporator;

[0090] The ambient temperature and humidity detection module 402 is used to detect the ambient temperature and relative humidity of the environment where the heat pump outdoor unit is located;

[0091] The cumulative operation time recording module 403 is used to record the cumulative operation time of the heat pump compressor;

[0092] The control module 404 is used to:

[0093] Determine the defrost time according to the ambient temperature and relative humidity;

[0094] When the cumulative running time of the compressor reaches the defrost time and the surface temperature of the evaporator meets the preset temperature condition, the heat pump is controlled to perform the defrost procedure on the evaporator.

[0095] In a possible embodiment of the present application, a heat pump defrost control device is provided. Figure 5 Schematic diagram of a heat pump defrosting control device provided in an embodiment of the present application. Figure 5 As shown, the device 50 includes: a memory 501 , a processor 502 , and an interactive interface 503 , and the memory 501 , the processor 502 , and the interactive interface 503 are connected via a bus 504 .

[0096] The memory 501 is used to store programs and data, and the processor 502 calls the program stored in the memory 501 to execute the heat pump defrosting control method as described above.

[0097] The specific implementation process of the processor 502 can be found in the above method embodiment, and its implementation principle and technical effect are similar, so this embodiment will not be repeated here.

[0098] In the above Figure 5In the illustrated embodiment, it should be understood that the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the invention may be directly implemented as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0099] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include a non-volatile memory (Non-volatile Memory, NVM), such as at least one disk memory.

[0100] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of this application is not limited to only one bus or type of bus.

[0101] In a possible embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the heat pump defrost control method described above is implemented.

[0102] The computer-readable storage medium mentioned above can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0103] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (Application Specific Integrated Circuits, referred to as ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0104] The division of the units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, which may be electrical, mechanical or other forms.

[0105] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0106] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0107] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0108] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0109] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments, and the above embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A heat pump defrosting control method, characterized in that: The method comprises: Detecting the surface temperature of the heat pump evaporator, and detecting the ambient temperature and relative humidity of the environment in which the heat pump evaporator is located; Determining the defrosting time according to the ambient temperature and the relative humidity; When the accumulated operation time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, the heat pump is controlled to perform a defrosting procedure on the evaporator.

2. The method according to claim 1, characterized in that The step of determining the defrosting time according to the ambient temperature and the relative humidity includes: Determine the ambient temperature interval in which the ambient temperature is located according to the ambient temperature; The defrost duration is determined according to the ambient temperature range and the relative humidity.

3. The method according to claim 2, characterized in that Determining the defrosting time according to the ambient temperature range and the relative humidity includes: If the ambient temperature is in the defrosting ambient temperature range, the greater the relative humidity, the shorter the defrosting time.

4. The method according to claim 1, characterized in that: The detecting the surface temperature of the heat pump evaporator comprises: If the surface temperature of the heat pump evaporator is less than or equal to the first preset temperature threshold, the low temperature duration of the heat pump evaporator is recorded, and the low temperature duration is the duration that the surface temperature of the heat pump evaporator is less than or equal to the preset temperature threshold.

5. The method according to claim 4, characterized in that The evaporator surface temperature meets the preset temperature condition, including: The low temperature duration reaches a first low temperature duration threshold.

6. The method according to claim 1, characterized in that Before detecting the surface temperature of the heat pump evaporator, and detecting the accumulated running time of the heat pump compressor, and the ambient temperature and relative humidity of the environment where the heat pump outdoor unit is located, the method further includes: After the heat pump is powered on for the first time, the accumulated running time of the heat pump compressor is recorded, and the surface temperature of the heat pump evaporator is detected; When the accumulated operation time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, the heat pump is controlled to perform a defrosting procedure on the evaporator, and the accumulated operation time of the heat pump compressor is cleared.

7. The method according to claim 6, characterized in that The accumulated running time of the heat pump compressor and the surface temperature of the heat pump evaporator meet the preset defrosting conditions, including: The accumulated operation time of the heat pump compressor reaches a fifth preset time, and the duration of the surface temperature of the heat pump evaporator being lower than the second preset temperature threshold reaches a second low temperature duration threshold.

8. A heat pump defrost control device, characterized in that: The device comprises: An evaporator temperature detection module, used to detect the surface temperature of the heat pump evaporator; An environmental temperature and humidity detection module, used to detect the environmental temperature and relative humidity of the environment in which the heat pump outdoor unit is located; A cumulative operation time recording module, used to record the cumulative operation time of the heat pump compressor; Control module for: Determining the defrosting time according to the ambient temperature and the relative humidity; When the accumulated operation time of the compressor reaches the defrosting time and the surface temperature of the evaporator meets the preset temperature condition, the heat pump is controlled to perform a defrosting procedure on the evaporator.

9. A heat pump defrost control device, characterized in that: The device comprises: Processor, memory, and interactive interface; The memory is used to store programs and data, and the processor calls the program stored in the memory to execute the heat pump defrost control method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the heat pump defrost control method according to any one of claims 1 to 7 is implemented.

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